CHINESE JOURNAL OF ENERGETIC MATERIALS
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SC-CO2辅助高固含量发射药代料挤出加工的流变行为(英)
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1.南京理工大学化工学院, 江苏 南京 210094;2.南京理工大学特种能源材料教育部重点实验室, 江苏 南京 210094

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Rheological Behavior of High Solid Content Propellant Substitutes in Extrusion Process Assisted with SC-CO2
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1.School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2.Key Laboratory of Special Energy Materials (Nanjing University of Science and Technology), Ministry of Education, Nanjing 210094, China

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    摘要:

    为了改善高固含量发射药挤出加工时流变性能,采用超临界二氧化碳(SC-CO2)作为增塑剂辅助高固含量发射药代料醋酸纤维素/碳酸钙(CA/CaCO3)挤出加工,通过狭缝流变仪和幂律方程研究了CA/CaCO3和CA/CaCO3/SC-CO2溶液的在线流变行为,使用Polyflow软件模拟了CA/CaCO3/SC-CO2溶液的分散混合性能。结果表明,温度为50 ℃时,SC-CO2使CA/CaCO3溶液的稠度系数降低了26.00%,非牛顿指数增加了16.67%,降低了CA/CaCO3溶液在挤出过程的粘度和压力;随着加工温度的升高,CA/CaCO3/SC-CO2溶液的粘度降低;在低剪切速率下,CA/CaCO3/SC-CO2溶液的剪切粘度对温度的敏感性较高;根据模拟结果,温度为50 ℃时,CA/CaCO3/SC-CO2溶液经受最大剪切应力的最大概率密度比CA/CaCO3溶液增加了20.63%,SC-CO2的注入有利于CA/CaCO3溶液分散混合性能的提高。

    Abstract:

    In order to solve the problem of high viscosity of high solid content propellants, supercritical carbon dioxide (SC-CO2) has been used as a plasticizer to improve its rheological behavior. The in-line viscosity of the CA/CaCO3 solution was measured by a slit die rheometer during the extrusion process assisted with SC-CO2, and the Power law was used to describe the rheological behavior of CA/CaCO3 and CA/CaCO3/SC-CO2 solutions. Polyflow was utilized to model the dispersive mixing properties of the CA/CaCO3/SC-CO2 solutions. Results show that with the presence of SC-CO2, the viscosity and pressure of the CA/CaCO3 solution decreases significantly.And the viscosity coefficient of the CA/CaCO3 solution at 50℃ decreases by 26.00%, while its non-Newtonian index increases by approximately 16.67%. As the extrusion temperature increases, the viscosity of the CA/CaCO3/SC-CO2 solution decreases, and its shear viscosity is less sensitive to temperature at higher shear rate. According to this simulation results, when the CA/CaCO3/SC-CO2 solution is subjected to the maximum shear stress, the maximum probability density increases by 20.63% at 50 ℃, which confirms that SC-CO2 improves the dispersion mixing properties of the CA/CaCO3 solution.

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引用本文

阮建,熊奥,丁亚军,等. SC-CO2辅助高固含量发射药代料挤出加工的流变行为(英)[J].含能材料, 2020, 28(6):504-513. DOI:10.11943/CJEM2019287.
RUAN Jian, XIONG Ao, DING Ya-jun, et al. Rheological Behavior of High Solid Content Propellant Substitutes in Extrusion Process Assisted with SC-CO2[J]. Chinese Journal of Energetic Materials, 2020, 28(6):504-513. DOI:10.11943/CJEM2019287.

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历史
  • 收稿日期: 2019-11-12
  • 最后修改日期: 2020-03-15
  • 录用日期: 2020-03-03
  • 在线发布日期: 2020-03-10
  • 出版日期: 2020-06-25